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    For what interval is this function convex
    5x^2 - 6x - ln(x)?

    a) [-1/root10, 1/root 10]
    b) (-infinity, 2/root10]
    c) (0,+infinity)
    d) (-infinity, +infinity)

    The only possible answer is c since a function when its convex has to be convex for all the values, all the other answers have negative values which are not defined by the function given above, correct?
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    anyone?
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    I'd agree.
 
 
 
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Updated: January 17, 2010
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